docs: update readme to correct version and fix link

[JordanSussman]

❤ THANKS FOR HELPING OUT :D

Proposed change

• Fix broken link in README
• Update README to have correct versions of packages installed in docker images

Types of changes

What types of changes is this pull request introducing to flottbot? Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

You can fill this out after creating your PR. Put an x in the boxes that apply

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[coveralls]

Pull Request Test Coverage Report for Build 1781211149

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 1767515183:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls

[wass3r]

TY